James robertson



(No Model.)

J. ROBERTSON. HYDRAULIC PRESSING APPARATUS.

No. 560,934. Patented May 26, 1896.

UNITED STATES PATENT OEEICE.

JAMES ROBERTSON, OE MANCHESTER, ENGLAND.

HYDRAULIC PRESSING APPARATUS.

SPECIFICATION forming part of Letters Patent No. 560,934, dated. May 26, 1896. Application filed May 16,1895. Serial No. 549,519. (No model.) Patented in England March L1=,1893, No. 4,722.

'To a/ZZ whom it may concern:

Be it known that I, JAMES ROBERTSON, of Manchester, in the county of Lancaster, England, have invented certainnew and useful Improvements in Hydraulic Pressing Apparatus, of which the following is a specification, which improvements are shown and described 'in Letters Patent of Great Britain No. 4,722,

dated March 4, 1893.

This invention relates to hydraulic pressing apparatus for use in shaping metals by the forging process, wherein liquid-actuating according as the force is to be modied or entirely removed, the operation of the ram-motor not being interrupted in either case.

The drawings which accompany and form part of this specification illustrate an embodiment of the invention.

Figure l shows a sectionalized side elevation of the apparatus. Fig. 2 shows a top plan view of the same, some parts being represented as broken away. Fig. 3 shows an end elevation of the press.

W designates the crank-shaft of a singleacting engine, W2 the crank, and W the flywheel. Said crank is connected by a coupling-rod W5 with a cross-head W6, which constitutes part of a rectangular frame carrying the liquid-actuatin g rams A7 and A8, pointing toward each other and operating in cylinders 116 117.

The press itself is of the following construction: The forging-head K13 is pivotally engaged by one end of lever V, which is supported by a pivot-pin V in the base-support Q5, and the opposite end of said lever engages a counterbalance P16. The forging-head has a ram K14, entering a Xed cylinder J17, and the counterbalance has a ram P17, entering a cylinder P18. Pipes O12 and P19 connect the cylinders .117 and P18 with the cylinders 116 and 117, which inclose the liquid-forcing rams.

The general operation will be readily understood, reciprocations of the liquid-actuating rams alternately forcing the liquid into the press-cylinders and producing reciprocations of the forging-head with oscillations of the lever Y. T-shaped pipes Y and a valvecasing Y form a waterway connecting the two cylinders 116 and 117. A stop-cock Y2 in the casing Y controls circulation of the liquid and is provided with a handle Y3 for manipulation by the attendant. When the press-rams are tO be Wrought the full stroke of the liquid-forcing rams, the cock Y2 is kept closed; but when the stroke of the forgingram is desired to be reduced in length or in force the cock is partly opened, which allows a portion of the operating iiuid to pass from one cylinder to the other. Forging operations canbe entirely suspended by fully opening the cock, as will be apparent, while the engine continues running.

What 1 claim as my invention is as follows:

1. 1n hydraulic pressing apparatus, the combination with a press having a forginghead carrying advancing and retracting liquid-actuated rams and cylinders inclosing the same, of 'a pair of connected liquid-actuating rams, cylinders inclosing the latter, suitable waterways connecting the said cylinders respectively with those inclosing the press-rams, a motor connected with the liquid-actuating rams to reciprocate the same, a waterway connecting the two actuatingram cylinders, and a hand-controlled valve in said waterway.

2. 1n hydraulic pressing apparatus, the combination of a forging-head having a ram, a lever engaging said forging-head, a counterbalance engaged with said lever and having a ram, cylinders inclosing said rams respectively, and double acting liquid forcing means communicating with said cylinders.

1n testimony whereof 1 have signed my name to this specification, in the presence of two subscribing witnesses, this 3d day of April, A. D. 1895.

JAMES ROBERTSON.

Vitnesses:

ARTHUR C. HALL, JOHN H. THOMAS. 

